I'm in a relationship now. I gave up on them for years though.
To begin with I had no choice. As a single mother of two with a full time job and massive childcare costs, I could not afford a social life that didn't involve anything other than going round to friends' houses or them coming to mine. Babysitting for the odd date - let alone regularly enough to establish a relationship - was simply not an option.
By the time I could afford to restart my social life, I had become so accustomed to living without a relationship that I didn't want one and was far more interested in exploring new interests and friendships. I had many great years really loving life as a single person.
The irony is, of course, that once you embrace the single life quite often you don't want a relationship any more.
Like I said above, I am actually in a relationship at the moment. It was during my happy-being-single phase that I met current BF (through work). I very nearly turned him down because I liked life as a single person so much I was unwilling to lose the freedom of it. Fortunately, he completely understands my need for autonomy and feels similarly himself (and the sexual chemistry was quite strong
) so I agreed to see how things went. We took things incredibly slowly and thus far it's working out great.
We've been together a while now and while we don't live together (nor have immediate plans to), I can honestly say I have all the good sides of being in a relationship (fun, regular sex, emotional support) and none of the downsides.
Some people are just lucky and meet the right person through chance. Some people are just unlucky and fall prey to arseholes through no fault of their own and despite actively looking for red flags. Other people (me included) are most likely to find a good relationship by being in the mindset where they really can take it or leave it, because that level of objectivity gives you so much more ability to spot the liars/cheats/uncaring/feckless/nice-but-unreliable/etc and pass over them before they've sucked you in deep enough to hurt you.
OP - try not to think of it as giving up on relationships as embracing a life where your own needs come first.